The latest issue of Shogakukan's Weekly Big Comic Spirits contains a one-shot manga titled Aozora Chu-Iho (Blue Sky Advisory Kiss). The title is accredited to Ujiko-Ujio, a fictional mangaka duo in Naoki Urasawa's 20th Century Boys.

In 20th Century Boys, the duo wind up stuck in the events that occur through the story.

Weekly Big Comic Spirits also published 20th Century Boys from 1999 to 2006. The series spawned three live-action films, as well as the sequel manga 21st Century Boys.

Viz currently owns the rights to the 20th Century Boys manga. The first volume hit American retailers earlier this month.